Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Magnonics II
MA 48.7: Vortrag
Donnerstag, 12. März 2026, 16:30–16:45, HSZ/0004
High-Resolution Field Mapping of Parametric-Instability Thresholds in YIG Films: Fine Structure and Magnon-Phonon Hybridization — •Tamara Azevedo1, Rostyslav O. Serha2, Yannik Kunz1, Matthias R. Schweizer1, Vitaliy I. Vasyuchka1, Mikhail Kostylev3, Burkard Hillebrands1, and Alexander A. Serga1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Faculty of Physics, University of Vienna, 1090 Vienna, Austria — 3Faculty of Physics, University of Western Australia, 6009 Perth, Australia
Parametric electromagnetic pumping of magnons is a central technique for exciting and amplifying spin waves. Determining the parametric-instability threshold where the supplied energy compensates intrinsic magnon damping is essential for understanding and controlling this process. Using a highly sensitive automated measurement scheme based on quasi-continuous-wave excitation from a vector network analyzer and a microstrip resonator, we determined the instability threshold in tangentially magnetized yttrium-iron-garnet (YIG) films as a function of the external field H0 with unprecedented magnetic-field resolution. For parallel pumping, the threshold power exhibits distinct features originating from magnon hybridization with transverse and longitudinal phonons, as well as fine structure caused by the competitive excitation of thickness modes. These results highlight the dynamics specific to parallel parametric pumping that govern the onset of instability and provide crucial insight for efficient magnonic devices.
Keywords: Magnonics